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A334564
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E.g.f.: exp(-(x + x^2 + x^3 + x^4)).
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3
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1, -1, -1, -1, 1, 139, 151, -1429, -19039, -170281, 517231, 12144439, 108063649, 294730019, -12338255929, -161010756061, -834576525119, 10909293532591, 350211422028511, 3176429907556079, -8268487440910399, -816508001025525061, -14017265801126968841, -55997107943920795301
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OFFSET
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0,6
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LINKS
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FORMULA
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a(0) = 1 and a(n) = - (n-1)! * Sum_{k=1..min(4,n)} k*a(n-k)/(n-k)!.
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MATHEMATICA
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m = 25; Range[0, m]! * CoefficientList[Series[Exp[-(x + x^2 + x^3 + x^4)], {x, 0, m}], x] (* Amiram Eldar, May 03 2021 *)
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PROG
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(PARI) N=40; x='x+O('x^N); Vec(serlaplace(exp(-x-x^2-x^3-x^4)))
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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STATUS
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approved
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